The simcard isn't really anything special - it is just a token that tells your phone which mobile network to connect to (e.g. Verizon, AT&T etc.), and also identifies your particular customer # to that provider so they know who to bill for the network usage.

You can put your simcard into any cellular device you like, provided that:

1) Your Nexus 7 is one of the models that accepts a simcard
2) Your Nexus 7 unlocked, or at least it is locked to the same provider as your simcard is for
3) Your provider isn't doing anything to intentionally cripple your use of the simcard

The Nexus 7 accepts a "micro sim card". This may be a smaller form factor than the sim card the Droid X2 accepts. If it is, you may need to cut your sim card down to size so it fits inside the Nexus 7. This is perfectly safe so long as you're careful and you use a template.

Lastly, I don't think phone calls will work on the Nexus 7. AFAIK the tablet does not have a "phone" app to place phone calls, but I could be wrong.

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adamtraskAuthor Commented: 2013-01-26

Thank you...

Just one more clarification.

I read some where that only Nexus 7 with mobile data can accept a SIM card and that WI FI versions of the tablet can't....! I was under the impression that a SIM card is the bridge to mobile data and since I am getting it from my phone, it should provide the tablet with the required mobile data. Am I right or wrong in this...?? My tablet is a WI FI version.

Sorry i couldn't understand correctly,
But the WiFi version connects to inter wia WIFI only
And the one with mobile data can connect via wifi and (edge, 3G or 4g)
So i you have a wifi version then you won't find a place to insert your sim card.

IDK if this helped but my english is poor and i couldn't understand your last comment